diff --git a/prologue/typography.xml b/prologue/typography.xml
index d394e9b17..393b7076b 100644
--- a/prologue/typography.xml
+++ b/prologue/typography.xml
@@ -34,7 +34,10 @@
 <screen><computeroutput>install-info: unknown option '--dir-file=/mnt/lfs/usr/info/dir'</computeroutput></screen>
 
   <para>This form of text (fixed-width text) shows screen output, usually as
-  the result of commands issued.  This format is also used to show filenames,
+  the result of commands issued.  If you are reading the book in the HTML
+  format (instead of PDF), the text should be blue.</para>
+
+  <para>The fixed-width text is also used to show filenames,
   such as <filename>/etc/ld.so.conf</filename>.</para>
 
   <note>